25085021 has 4 divisors (see below), whose sum is σ = 27014652. Its totient is φ = 23155392.

The previous prime is 25085017. The next prime is 25085023. The reversal of 25085021 is 12058052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15319396 + 9765625 = 3914^2 + 3125^2 .

It is not a de Polignac number, because 25085021 - 2² = 25085017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25085023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964796 + ... + 964821.

It is an arithmetic number, because the mean of its divisors is an integer number (6753663).

Almost surely, 2^25085021 is an apocalyptic number.

It is an amenable number.

25085021 is a deficient number, since it is larger than the sum of its proper divisors (1929631).

25085021 is a wasteful number, since it uses less digits than its factorization.

25085021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929630.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 25085021 is about 5008.4948836951. The cubic root of 25085021 is about 292.7328693197.

The spelling of 25085021 in words is "twenty-five million, eighty-five thousand, twenty-one".